Chemistry
The elements of one short period of the Periodic Table are given below in order from left to right :
Li Be B C O F Ne
(a) To which period do these elements belong ?
(b) One element of this period is missing. Which is the missing element and where should it be placed ?
(c) Place the three elements fluorine, beryllium and nitrogen in the order of increasing electronegativity.
(d) Which one of the above elements belongs to the halogen series ?
Periodic Table
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Answer
(a) These elements belong to the 2nd period.
(b) The missing element is Nitrogen. It belongs to the Group 15 and should be placed as shown below:
Li Be B C N O F
(c) Beryllium < Nitrogen < Fluorine.
(d) Fluorine.
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